The Treatment Of Coal Carbonized Phenol Wastewater By Modified Activated Carbon

Shaanxi Province's coal resource reserves ranks third in China, the non stick coal and weakly caking coal produced in Jurassic Coalfield in Yulin, Shenmu, Fugu and others areas accounted for about 53% of the province's total coal reserves.This kind of coal with low ash, low sulfur, low phosphorus, high calorific value can be pyrolysised in low temperature to recovery and get us of the tar and semi-coke and gas,it is conducive to the comprehensive utilization of resources.Yulin city is the important semi-coal production base of our country,the annual semi-coke production reached 44,630 thousand tons.Semi-coke and other related industries accounted for about 20% of the total industry.it is an important part of the economic development of Yulin city.The semi-coke production process will produce a large amount of waste water, waste gas, waste residue.The semi-coke wastewater has complex composition,and high concentration of pollutants which is difficult to be treated by biochemical degradation.Discharge the unqualified wastewater into the rivers will be a great threaten both to the nature and human beings.Therefore, economic and effective treatments of semi coking wastewater will make great contribution to the healthy and steady development of semi-coke industryThis paper study how to remove the phenol in semi-coke wastewater, as phenol content in coke wastewater is the highest.Chose the best adsorbent by selection and modifition,and optimize the conditions of the adsorption process to select the optimal adsorption conditions.Finally, the adsorption process was fitted to the adsorption model and the adsorption kinetics model, which provide theoretical support for the adsorption process.The major conclusions are as follows:1.The main organic pollutant of semi-coke waste is phenol and its derivatives and phenol accounted for 36.7% of the total organic content, the concentration of phenol is 3500mg/L;2.According to the experimental results of isothermal adsorption,choose the most practical and economy material AC as experimental adsorbent,and modify AC by high temperature, ultrasonic modification, chemical modification, chitosan,the results show that:when the mix proportion of chitosan and AC is 1:6,shows the best adsorption capacity of 67.01 mg/g. In conclude,selected CTS-AC6 as the best modify adsorbent;3.Single factor experiments and orthogonal experiments determine the optimal experimental conditions as:the pH value is 3, rotation speed 200r/min, adsorbent particle size is 120 mesh, the reaction temperature is 15?;Orthogonal experiment shows the order of the influence of the four factors is:reaction pH>shaker speed>adsorbent particle size> reaction temperature>;Optimized experimental conditions as;4.The isothermal adsorption processes of AC and modified CTS-AC6 are more in line with the Langrmuir adsorption model,indicates that the adsorbent surface is uniform,the adsorption of phenol on the surface of the adsorbent is no difference and basically the same type, and the adsorption process is a single molecular layer adsorption;5.The kinetics of phenol adsorption on CTS-AC6 at different temperatures was more in line with the two order kinetic equation;the kinetics of phenol adsorption on CTS-AC6 at different pH value was also more in line with the two order kinetic equation; and the equilibrium adsorption from two order kinetic model fit the experimental value better.